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If the problem was caused by 'playing with the BIOS' settings, then it's possible by simply resetting the CMOS memory to default or 'clearing' the settings you will regain access to the hard drive. See your user guide or the service manual (possibly available at the manufacturer website) for details on how to do that. (Note: clearing the CMOS memory almost always requires at least slipping the keyboard away from the case...but it may not require complete disconnect to do so. Whereas simply resetting the BIOS settings in the CMOS memory to default may be an option in the BIOS settings menu. Again, your user guide should show you how to do that if that option is available.)

Since you seem to also say the keyboard isn't working, I assume you're using a separate keyboard plugged-in to the laptop? Clearing/resetting the CMOS memory may also fix that problem.